Removing Leaf Springs

Does it take an impact wrench to remove the rear bolts or are mine just rusted on? Looks like I have to remove the fuel tank guard to remove the front bolt on the driver's side.
Used a big 1/2 breaker bar and a lot of torque and I couldn't budge them.

Take a torch and heat up the nuts pretty good, if you have to use an extension on the breaker bar to loosen the nuts, and you shouldnt have to remove the guard. Start the nuts with the breaker bar will help the impact gun. You could then use the air impact gun to get the nuts off. Unless its a strong gun.